Differential adjusting-rod for drums.



A. M. HOSKINS.

DIFFERENTIAL ADJUSTING ROD FOR DRUMS.

APPLICATION FILED MAR.31, 1913.

I Patented Nov. 4, 1913.

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UNITED STATES PATENT OFFICE.

ADELMOUR M. HOSKINS, OF MINNEAPOLIS, MINNESOTA.

DIFFERENTIAL ADJUSTING-ROD FOR DRUMS.

To all whom z't may concern:

Be it known that I, ADELMQUR M. Hos KINS, a citizen of the UnitedStates, residing at Minneapolis, in the county of Hennepin and State ofMinnesota, have invented certain new and useful Improvements inDifferential Adjusting-Rods for Drums; and I do hereby declare thefollowing to be a full, clear, and exact description of the invention,such as will enable others skilled in the art to which it appertains tomake and use the same.

My invention relates to improvements 1n adjusting rods for drums and, tothis end, it consists of the novel devices and combinations of deviceshereinafter described and defined in the claims.

' The invention is illustrated in the accompanying drawings, whereinlike characters indicate like parts throughout the several views. K

Referringto the drawings: Figure 1 is a side view of a drum havingincorporated therein my invention; and Fig. 2 is a view principally insection, taken on the line 00 m of Fig. 1, on an enlarged scale.

The numeral 1 indicates the shell of a drum, the numeral 2 the batterhead, and the numeral 3 the snare head. The batter head 2 is secured tothe shell 1 by the customary flesh hoop 4 and cotiperating counter hoop5, and the snare head 3 is secured to the shell 1 by the customary fleshhoop 6 and cooperating counter hoop 7.

The above described parts are those of a snare drum but, as far as myinvention is concerned, they will apply to any drum having two heads.

Referring now to my invention, which relates to the drum head adjustingdevices, it may be here stated that, as each drum requires amultiplicity of these devices and as these devices are identical onewith the other, the descriptions of one will suffice for both.

An anchor lug 8 having an internally threaded passage 9 is secured tothe periphery of the shell 1, intermediately of its two edges. The baseof the lug 8 is considerably wider than its upper or screw threadedportion and is rigidly secured to the shell 1, by rivets, to resistpulling strains on either of the counter hoops 5 and 7. Attached to thecounter hoop 5 is a hook 10, having an internally threaded sleeve 11,and attached Specification of Letters Patent.

Application filed March 31, 1913.

Patented Nov. 4, 1913. Serial No. 757,753.

to the counter hoop 7 is a hook 12, having a sleeve 13. The passagesthrough the lug 8 and sleeves 11 and 13 are all axially alined. Looselytelescoped through the sleeve 13 is a relatively short tubular adjustingrod 14, having screw threaded engagement, at its inner end, with the lug8. Rigidly secured to the outer end of the rod 14 is a thumb piece 15,which reacts against the outer portion of the hook 12 and its sleeve 13.Loosely telescoped through the tubular rod 14 is a relatively longadjusting rod 16, having screw threaded engagement, at one end, with thesleeve 11, and having, at its other end, a thumb piece 17, which reactsagainst the thumb piece 15. The threads on the long rod 16 must havegreater pitch or travel than the threads on the short rod 14, preferablytwice as great. This can be accomplished by providing the long rod 16with double threads or with threads that are twice as coarse as those ofthe short rods 14. By placing the thumb pieces 15 and 17 close together,the same may be turned together or separately, to simultaneously orindependently work the rods 14 and 16 in the adjustment of the heads 2and 3. If the threads on the rods 14 and 16 are of the same pitch, whenthe two rods are rotated simultaneously the snare head 3 would betightened but the batter head 2 would not. The reason for this is that,when the two rods 14 and 16 are rotated together, the latter partakes ofthe endwise movements of the former, and, hence, to cause thesesimultaneous movements of the two rods to simul taneously tighten bothheads, the threads on the said rods 16 must move into the sleeve 11 ofthe hook 10 faster than the said rods 14 and 16 move endwise through thecotiperating lug 8.

The advantages of my improved device may be briefly stated as follows:The drum heads may be either simultaneously or independently adjust-ed;the batter head may be taken off without removing the snare head; thetwo heads will be kept parallel or true; the snare head may be placedunder less tension than the batter head, which is a great advantage inplaying; both heads may be tightened from the bottom of the drum,thereby allowing the batter head to be free from tightenin keys; aseparate tightening key is not necessary; and a very thin snare head canbe used in connection with a batter head of ordinary thickness. As iswell known, a very thin snare head produces a much better tone than athick one.

The above described device, in actual usage, has been found highlyefficient for the purpose had in view.

What I claim is:

1. The combination with a drum, of drum head adjusting rods telescopedone within the other and having operating devices located at one head ofsaid drum, for independently Or simultaneously adjusting said rods, atwill, substantially as described.

2. The combination with a drum shell, drum heads, and hoops for securingsaid heads to said shell, of a plurality of drum head adjusting devices,each comprising an anchor lug secured to said shell, fastenings appliedto said hoops, and adjusting rods tclescoped' one within the other, theouter of said rods having screw threaded engagement with said anchor lugand bearing against one of said fastenings, and the inner rod havingscrew threaded engagement with the other of said fastenings and bearingagainst said outer rod, said rods being adapted to be turned to adjustsaid fastenings, substantially as described.

3. The combination with a drum shell, drum heads, and hoops for securingsaid heads to said shell, of a plurality of drum head adjusting devices,each comprising an anchor lug secured to said shell, fastenings appliedto said hoops, and adjusting rods telescoped one within the other, theouter of said rods having screw threaded engagement with said anchor lugand having a thumb piece bearing against one of: said tastenin 's, andthe inner rod having screw threaded engagement with the other of saidfastenings and having a thumb piece hearing against the thumb piece ofsaid outer rod, said rods being adapted to be turned by said thumbpieces to adjust said fastenings, substantially as described.

t. The combination with a drum shell, drum heads, and hoops for securingsaid heads to said shell, of a plurality of drum head adjusting devices,each comprising an anchor lug secured to said shell, sleeve equippedhooks applied to said hoops, and adjusting rods telescoped one withinthe other and passed through the sleeve of one of said hooks, the outerof said rods having screw threaded engagement with said lug and having athumb piece reacting against the sleeve through which it is passed, andthe inner rod having screw threaded engagement with the other of saidsleeves and having a thumb piece reacting against the thumb piece ofsaid outer rod, said rods being adapted to be turned by said thumbpieces to adjust said fastenings, substantially as described. i

In testimony whereof I aiiix my signature in presence of two witnesses.

ADELMOUR M. HOSKINS. lVitnesses HARRY D. KiLeonn, Bremen G. VHEELER.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents. Washington, D. G.

